I am still new to the game, and am building a test deck on TCO. I was told that Warbeasts (which I was including in the deck) have high enough speed and courage that I could get away with swapping shriek shock and spirit gust for velocitrap and shadow strike. However, I am confused, as both state the word "Challenge" in their card text. So I don't understand. If I have a Warbeast (let's say, Blazvitan) use these attacks, what happens? Does it check my stats, my opponents', both?